Furnace construction



March 10, 1931. ALLEN 1,795,357

FURNACE CONSTRUCTION Filed May 26, 1927 I 3 Sheets-Sheet 1 j INVENTOR FM6 M ATTORNEYS March 10, 1931 I REALLEN 1,795,357

FURNACE CONSTRUCT I ON Filed May 26, 1927 3 SheetsSheet 2 INVENTOR Fzy -AiTORNEYS March 10, 1931. B, ALLEN 1 ,795 ,3 57- FURNACE CONSTRUCTIONFiled May 26, 192? 5 Sheets-Sheet 3 V g IN/ViNTOR ATTO R N EYS PatentedMar. 10, 1931 UNITED .STATES PATENT. OFFICE FRANK B. ALLEN, OF LOWERMARION TOWN SHIP. MONTGOMERY COUNTY, PENNSYL- VANIA, ASSIGNOR, BY MESNEASSIGNMENTS, TO THE ALLEN-SHERMAN-HOFF COMPANY, OF PHILADELPHIA, IPENNSYLVANIA, A CORPORATION OF PENNSYL- VANIA.

FURNACE CONSTRUCTION Application filed May 26, 1927. Serial No. 194,384.

This invention relates to apparatus for handling hot solid materialssuch as ashes and the like produced upon the combustion of fuel infurnaces.

Heretofore, ashes and other like products, formed upon combustion offuel in furnaces such as are used in boilers, have been received in ashhoppers or receptacles and discharged therefrom in various ways, theashes and the walls of the compartments in which they are received beingcooled as by being sprayed with water. The ashes contain considerablequalities of heat and in general this has been lost or merelydissipated, not only doing no useful work, but frequently doingconsiderable damage, particularly to the walls of the receptacle.

By the application of my invention, it is possible to protect the wallsof containers from the excessive temperatures to which former types ofWalls were subjected by heat from the hot solid material and at the sametime to absorb the heat radiated by said material so that this heat maybe used to perform useful functions.

The invention will be better understood from the description of twopractical embodiments thereof illustrated in the accompanying drawings,in which Fig. 1 is a transverse section of a boiler furnace bottomembodying my invention taken along the line II of Figure 2;

Fig. 2 is a view, partly in longitudinal section, on the line H H ofFig. 1 and partly in elevation; and

Fig. 3 is a transverse section of a modified form of furnace bottom.

In Figs. 1 and 2 the furnace wall is indicated at 1, and the furnacebottom is enclosed by two downwardly converging side walls and verticalends. One of these walls is of refractory material, indicated at 2,supported upon a metallic frame work 3, there being upwardly extendingpassages 4 interposed between the refractory material and the metal,through which passages air may be- This air caused to flow to cool thewalls. may be caused to move through these passages in any desiredmanner but is illustrated as being drawn through the same by a vent 5extending upwardly within the furnace wall. The other wall of thefurnace bottom is in the form of a water wall comprising a continuo nsseries of inner plates 6 carried upon a series of upwardly extendingpipes 7 extending from a header 8 to a second or upper header 9, the ppes being disposed closely together and in mtimate contact with theplates 6 so thatheat reaching these plates is readily transmitted to thepipes and so to the water within the same.

The ends of the bottom are composed of plates 1Q similar to plates 6above described and carried upon pipes 11 extending upwardly fromheaders 12.

As shown, the first mentioned wall extends to a considerable distancebelow the lower edges of the water walls, and walls 13 and 14, composedof metallic frame work and refractory lining, extend upwards from thelevel of the lower end of the first mentioned wall to the bottom of thewater walls.

lhe walls 13 and 14, together with the firstnn-wntnmed walls from an ashreceiving hopper wh ch is relatively long and narrow and wlnch 1Soverhung by a bend 15 in the side water wall. The bottom of this hopperis divided by crickets 16 into a plurality of discharge openmgs, each ofwhich is provided with a closure or door 17. The doors may be operatedby handles 18 and pinions 19 engaging rack-teeth on the doors to controlthe discharge of ashes from the hoppers.

Below each pair of discharge openings are downwardly converging feedplates 20 upon which the ashes are discharged upon the openmg of thedoors and down which they are conveyeidbylwater fiozln nozzles 21 to acentral or s uice iopper 1.2 iavin a rating or 1'' 23 n thebottomthereof: below which is sluiceway 24 along which the ashes areconveyed by a stream of water from nozzles, such as 25, to a point ofdisposal. Access doors are provided 1n the sides of the sluice hopper sothat large SOllCl pieces of material may be remgyeld from the grid orbroken thereon.

sles are received into the ho) er below the bend 15 of the water wallarid the heat radiated from the ashes is absorbed by the water wallandcaused to perform useful work in heating the water therein, which may bethe feed-water for the boiler, or the like. The heat which reaches therefractory lining 2 of the long inclined wall is reflected therefrom andalso reaches the plates 6 and 10 of water walls, and is absorbed by thewater. This absorption of the heat reaching the plates 6 and 10 and therefractory lining 2 keeps these sufficiently cool that they will notdeteriorate rapidly, at the same time utilizing the heat for usefulwork.

It is apparent that the ash receiving hopper is defined by the lowerportion of the inclined wall 2, together with the vertically disposedwall 13, and the side walls. This hopper is partially covered by theoverhung portion 15 of the furnace bottom which is defined by theinclined wall 6 together with the upper portion of the wall 2 and theside walls.

In the modification shown in Fig. 3, two opposed water walls, composedof plates 30 and 31, and tubes 32 and 33, are used instead of using awall with refractory lining as shown in the first modification. Iheashes are received below the bends 34 and 35 of these water walls inhoppers formed by vertical walls 36 and 37, each consisting of a metalframe work of refractory lining, and a central cricket 38.- The hoppersterminate at their bottoms in discharge openings closed by doors 39 and40, through which openings the ashes may be discharged upon feed plates41, down which they may be conveyed by streams of water from jets 42 toa central or sluice hopper 43. The bottom of this hopper is providedwith a grid 44 above a sluice 45, by means of which sluice the ashes areconveyed to a point of disposal. Doors 46 are provided in the walls ofthe compartment formed to enclose the feed plates and sluice hopper toprovideeccess to the grids and permit large solid pieces of material tobe removed therefrom or broken thereon.

In this modification the heat radiated from the ashes is, of course,absorbed by the bends 34 and 35 of the water walls and in a mannersimilar to that described in connection with the first modification,these walls are kept sufficiently cool to prevent rapid deteriorationwhile the heat absorbed is used for some useful purpose.

While I have described the illustrated embodiments of my invention insome particularity, these embodiments are shown by way of illustrationonly and not by way of limitation, and I do not, therefore, limit myselfto the precise details shown and described but claim as my invention allmodifications thereof coming within the scope of the appended claims.

Claims:

1. Inafurnace, a hopper having a discharge opening, a closure therefor,a furnace bottom, a side wall of the hopper being inclined to thehorizontal at an angle greater than the angle of repose of combustionresidues and extending upwardly to form a wall of the furnacebottom,'the opposed wall of the furnace bottom being inclined downwardlytoward the first mentioned wall and overhanging the hopper.

2. In a furnace, a hopper having a dis charge opening, a closuretherefor, a furnace bottom, a side wall of the hopper being inclined tothe horizontal at an angle greater than the angle of repose ofcombustion residues and extending upwardly to form a wall of the furnacebottom, the opposed wall of the furnace bottom being inclined downwardlytoward the first mentioned wall and bulging inwardly at its base overthe hopper.

3. In a furnace, a hopper having a discharge opening, a closuretherefor, a furnace bottom,aside wall of the hopper being formed ofrefractory material provided with pas sages therein adapted to receivecooling fluid and inclined tov the horizontal at an angle greater thanthe angle of repose of combustion residues and extending upwardly toform a wall of the furnace bottom, the opposed wall of the furnacebottom being inclined downwardly toward the first mentioned wall andoverhanging the hopper and provided with passages therein adapted toreceive cooling fluid.

4. In a furnace, a hopper'having a discharge opening, a closuretherefor, a furnace bottom, a side wall of the hopper being formed ofrefractory material and inclined to the horizontal at an angle greaterthan the angle of repose of combustion residues and extending upwardlyto form a wall of the furnace bottom, the opposed wall of the furnacebottom being inclined downwardly toward the first mentioned wall andbulging inwardly at its base over the hopper and provided with passagestherein adapted to receive fluid to be heated.

In testimony whereof I hereunto afiix my signature this 25th day of May,1927.

FRANK B. ALLEN.

